The aim of marketing is to know and understand the customer so well the product or service fits him and sells itself. Peter Drucker
People fail at marketing for a variety of reasons. This list is not meant to be all-inclusive but here are the most common reasons I encounter:
Never been trained in marketing
Don’t understand the psychology of marketing
Are not consistent in their marketing message
Don’t ask for help because they don’t know who to trust
Don’t want to do it for themselves
Don’t know what works and do not want to spend the money
Dispatches From The Front 